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Actually, even the 2.7 is a good engine when maintained. My wife drives a 2000 intrepid with over 115k miles on it. We have owned it since 20K and have always used Mobil 1 in the car since it was known for the sludge issue. The only repair to the car (non maintenance) was a crankshaft position sensor that went out at 109,000. We routinely get 22 in town and 30 on the highway on cruise at 75mph out of this car. It has had a few mods done to it though. Smoother intake to a K&N filter, better tires etc.
Now, since you are looking used, I would likely shy away from a 2.7 unless either you know the car and how it was maintained, or the PO can show you the record of every maintenenace that has been done.
There were 2 larger engines available, both do not seem to have the sludge issue, but still need the maintenance done. Dodoge vehicles do seem to be picky about the oil changes, but it not like they don't post the intervals in the owners manual or anything....
If you are looking for long term reliabalilty, I would be tempted to look at any Buick (or gm) with the 3.8l...the 231 v6. It is an engine renown for it's reliability. In a park avenue, driven moderatley 27-28 is pretty normal, and they are quiet and comfortable. The regal is a little smaller, gets a little better MPG.
As far as the fords go, they are probably the quietest being full framed and rear wheel drive. They are also the heaviest. I have a friend who drives one 30K+ a year as a regional sales rep. At 65mph he gets 27 and at 75 he gets 24-25. He keeps it though because of the loads he carries in samples, and it is better than a SUV.
Ultimately, they can all be good cars depending on how they are cared for.
Jim
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